PART1 Participants in Part 1 (Run-in-Phase) of study will receive Tocilizumab (TCZ) (RoActemra/Actemra) 12 milligrams per kilogram (mg/kg) or 8 mg/kg intravenously (IV) every 2 weeks (Q2W) for up to 24 weeks. Participants who experience a laboratory abnormality during part 1 may be eligible to move into Part 2 of the study.